Can I get band 14 on a Tmobile Note 9

I have a Tmobile carrier model Note 9. I am looking to switch to the AT&T Firstnet system, as I just found out about it. Using *#2263# method I noticed there is no band 14 option which Firstnet relies heavily on. So my question is if I use the tmobile unlock device app will it open up additional bands? If not, is att able to flash it someway to open up band 14?

Thanks in advance for any info!

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